Pellaea glabella Mettenius ex Kuhn ssp. glabella . Phen: May-Sep. Hab: Dry, exposed outcrops of calcareous rocks (limestone, dolostone), rarely on masonry walls (Wieboldt 1995). Dist: The diploid, sexually-reproducing P. glabella ssp. missouriensis (Gastony) Windham is (so far as is known) restricted to MO; the apogamously-reproducing autotetraploid derivative, ssp. glabella, is more widespread, ranging from VT, ONT, and MN, south to VA, TN, ne. AL (Barger et al. (2019), KY, AR, OK, and n. TX.
Origin/Endemic status: Native
Taxonomy Comments: Two additional taxa (both western) have been variously treated as additional subspecies of P. glabella or as two subspecies of P. occidentalis (E.E. Nelson) Rydberg.
Synonymy: = Ar, FNA2, K1, K3, K4, NE, NY, TxFerns, Va; = Pellaea atropurpurea (L.) Link var. bushii Mack. – G; = Pellaea glabella Mett. ex Kuhn var. glabella – C, Mo1, Pa; < Hemionitis glabella (Mett. ex Kuhn) Christenh. – Christenhusz, Fay, & Byng (2018); < Pellaea glabella Mett. ex Kuhn – F, Il, Sf, Tn, Tx, W, WV; < Pellaea glabella Mett. ex Kuhn var. glabella – GrPl